I've just finished a resto on a CA2000, I used Nichicon PW in power supply areas, and Nichicon KT Audio grade caps in the signal path.....
Yes the Green Muse caps (ES) are Bi-Polar and so it does not matter which way they go.
Those are tantalums those blue ones, and they are all 100µf. I replaced them with KT Audio Caps.
There were also some FG Audio Grade Nichicons here and there as well.
Main caps I used Nichicon KG Gold Tunes.
On that preamp board you are working on there, you need to remove that switch assembly and dismantle those switches to clean them properly. They are all silver coated contacts and they tarnish, you'll find all that black crap all over them, the deoxit does not remove it, but it can slightly dissolve/dislodge it and then it gets under the contacts and you have drop out issues....
I also fitted heatsinks to the regulators and stood them up on the power supply board. That board gets very scorched with them lying down the way they do...
I managed to modify the stupid Meter Illumination circuit so I could get some LED's in there as well...
Just finished aligning it all and now I am having a listen...Yamaha made some nice gear, sounds really nice.
Couple of pics...